to study the reverse charateristics of zener diode

.zener diode is a silicon semiconductor with pn junction that is specifically designed to work in the reverse biased condition. .when diode is forward biased it behaves like a normal signal diode but when the reverse voltage is appplied to it the voltage remains constant for a wide range of currents. .due to this featuresit is used as a voltage regulator in dc circuit. .the primary objective of the zener diode as a voltage regulator is to maintain a constant voltage.